Levin S. Comly, 74, a teacher, counselor and vice principal in the Montgomery County school system who retired in 1974 with 31 years of service, died of an embolism Feb. 9 at the Shady Grove Adventist Hospital in Rockville.

Mr. Comly, who lived in Rockville, was born in Kennedyville, Md. He graduated from Washington College in Chestertown, Md., studied at Johns Hopkins University and took a master's degree at the University of Maryland. He served in the Army in World War II.

He began his teaching career in 1943. He was a social studies teacher and a vice principal at Richard Montgomery High in Rockville for 20 years. In 1963, he transferred to Thomas W. Pyle Junior High in Bethesda, where he retired as vice principal in 1974. He was a substitute teacher until 1981.

Mr. Comly was a member of St. Mary's Catholic Church in Rockville and its Holy Name Society. He also was a member of the Knights of Columbus and the Montgomery County Retired Teachers Association. After retiring from fulltime teaching, he was an usher at the Kennedy Center Opera House.

Survivors include his wife, Mary Agnes, of Rockville; five daughters, Anne C. Russell of New Windsor, Md., M. Barbara McIntyre of Houston, and M. Carole Day and Diane M. and Marcella E. Comly, all of Rockville; two sons, Dr. W. Michael of Minneapolis and L. Gregory of Boston; a sister, Marianna Darr of Camp Hill, Pa., and five grandchildren.